Girls, we're 10 weeks pregnant, today my belly is already hard in the …

Girls, we're 10 weeks pregnant, today my belly is already hard in the lower abdomen and pulls, the pain slightly goes into the back passage (sorry for the details). I think it's a spasm, something like this happens after I sit down or stand up for a while or lie down in an uncomfortable position, at least 15-20 minutes. After lying down, it passes, then again...how do others deal with this, what can be done in such a situation and is it dangerous for the baby? There are no suspicious discharge.